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PES SS 1 Chemistry 3rd Term Exam 2024-2025
  • 1. What type of reaction does the following equation represent? H3O+ OH- --> 2H2O
A) reduction
B) oxidation
C) neutralisation
D) hydrolysis
Chemistry
  • 2. The oxidation number of Y the formula above is ____
A) -6
B) +6
C) -7
D) +7
  • 3. Which statement best describes the process of reduction?
A) addition of oxygen
B) removal of electrons
C) increase in oxidation number
D) addition of hydrogen
Chemistry
  • 4. The oxidation number of Z the formula above is ____
A) +4
B) +2
C) -4
D) -2
  • 5. What is the oxidation number of Manganese in KMnO4?
A) +7
B) -7
C) -6
D) +6
  • 6. Name this compound. KMnO4
A) Potassium tetraoxomanganate (V)
B) Potassium hexaoxomanganate (IV)
C) Potassium tetraoxomanganate (VII)
D) Potassium hexaoxomanganate (VI)
  • 7. What is the oxidation number of Chromium in K2Cr2O7?
A) +6
B) +7
C) -7
D) -6
  • 8. What is the oxidation number of S in SO4-2?
A) +6
B) +8
C) -6
D) -8
  • 9. Which of the following is not a transition metal?
A) Na
B) Ag
C) Fe
D) Cu
  • 10. Which of the following is not an alkali metal?
A) Mg
B) Li
C) K
D) Na
  • 11. What is the chemical formula of Sodium chloride?
A) SCl
B) SCl2
C) NaCl
D) Na2Cl
  • 12. Which of the following indicates oxidation?
A) Removal of electrons
B) Addition of electrons
C) Removal of Oxygen
D) Addition of hydrogen
  • 13. Which of the following does not indicate reduction?
A) Removal of Oxygen
B) Removal of electrons
C) Addition of electrons
D) Addition of hydrogen
Chemistry
  • 14. What does x represent?
A) -1
B) +3
C) +5
D) -3
  • 15. What type of reaction is represented here? AB +CD --> AD + CB
A) Catalytic
B) Double decomposition
C) Thermal dissociation
D) Displacement
  • 16. What is the name of this compound? HNO3
A) Trioxonitrate (IV) acid
B) Trioxonitrate (V) acid
C) Trioxonitrate (III) acid
D) Trioxonitrate (VI) acid
  • 17. Neutralization is the reaction between ________ and ___________
A) a base and a salt
B) an acid and a base
C) an acid and a salt
D) a salt and water
  • 18. Ammonium Chloride is written as __________
A) (NH4)_2Cl
B) NH4Cl
C) NH4Cl2
D) (NH4)_2Cl2
  • 19. Which element has the atomic number 7?
A) Nitrogen
B) Carbon
C) Oxygen
D) Fluorine
  • 20. Which of the following is the correct way to write Aluminium trioxocarbonate (IV)?
A) Al2(CO3)_3
B) Al(CO3)_3
C) Al(CO3)
D) Al3(CO3)_2
  • 21. At constant volume, the pressure of a gas is directly proportional to the temperature in Kelvin. This is the statement of _________
A) Gay-Lusaac's Law
B) Avogadro's Law
C) Charles' Law
D) Boyle's Law
  • 22. What are amphoteric oxides?
A) Metallic oxides that exhibit both physical and chemical properties
B) Metallic oxides that exhibit both acidic and basic properties
C) Non-metallic oxides that exhibit both physical and chemical properties
D) Non-metallic oxides that exhibit both acidic and basic properties
  • 23. Which of the following is the correct way to write Potassium trioxonitrate (V)?
A) KNO3
B) K(NO3)_2
C) K2NO3
D) K2(NO3)_3
  • 24. Which of the following is not an alkaline earth metal?
A) Ca
B) Mg
C) Be
D) Na
Chemistry
  • 25. Which of the following is oxidation?
A) a
B) d
C) c
D) b
Chemistry
  • 26. Which of the following is reduction?
A) a
B) d
C) b
D) c
Chemistry
  • 27. The reaction shown here is an example of ____________
A) Displacement
B) Thermal dissociation
C) Combination
D) Decomposition
Chemistry
  • 28. The reaction shown here is an example of ____________
A) Decomposition
B) Catalytic
C) Displacement
D) Combination
  • 29. The chemical symbol of Sodium is ___
  • 30. The chemical symbol of Potassium is ___
  • 31. The chemical symbol of Magnesium is ___
  • 32. The chemical symbol of Nitrogen is ___
  • 33. The chemical symbol of Copper is ___
  • 34. The chemical symbol of Manganese is ___
  • 35. The chemical symbol of Iron is ___
  • 36. The existence in the same physical state of two or more structural forms of the same element is known as ____
A) eclipse
B) isotopy
C) hybridization
D) allotropy
  • 37. Which groups are known as halogens?
A) group 8
B) group 5
C) group 9
D) group 7
  • 38. Calculate the molar mass of Potassium chloride (k=39, Cl=35.5)
A) 74.5gmol-1
B) 47gmol-1
C) 74gmol-1
D) 58.5gmol-1
  • 39. _____is a process of preventing iron from rusting by protecting it with other metals like copper, tin, gold and silver
A) Painting
B) Greasing
C) Electroplating
D) Oiling
  • 40. The symbol of silver is written as
A) Au
B) Ag
C) Al
D) Si
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